1 files changed, 27 insertions, 0 deletions
diff --git a/tools/test/LcovMerger/java/com/google/devtools/lcovmerger/Coverage.java b/tools/test/LcovMerger/java/com/google/devtools/lcovmerger/Coverage.java
index 75eaa420cc..42e5be5ae1 100644
--- a/tools/test/LcovMerger/java/com/google/devtools/lcovmerger/Coverage.java
+++ b/tools/test/LcovMerger/java/com/google/devtools/lcovmerger/Coverage.java
@@ -15,6 +15,7 @@
 package com.google.devtools.lcovmerger;
 
 import java.util.Collection;
+import java.util.List;
 import java.util.TreeMap;
 
 class Coverage {
@@ -45,6 +46,32 @@ class Coverage {
     return merged;
   }
 
+  static Coverage filterOutMatchingSources(Coverage coverage, List<String> regexes)
+      throws IllegalArgumentException {
+    if (coverage == null || regexes == null) {
+      throw new IllegalArgumentException("Coverage and regex should not be null.");
+    }
+    if (regexes.isEmpty()) {
+      return coverage;
+    }
+    Coverage filteredCoverage = new Coverage();
+    for (SourceFileCoverage source : coverage.getAllSourceFiles()) {
+      if (!matchesAnyRegex(source.sourceFileName(), regexes)) {
+        filteredCoverage.add(source);
+      }
+    }
+    return filteredCoverage;
+  }
+
+  private static boolean matchesAnyRegex(String input, List<String> regexes) {
+    for (String regex : regexes) {
+      if (input.matches(regex)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
   boolean isEmpty() {
     return sourceFiles.isEmpty();
   }